Flaming-arc lamp.



G. M. LITTLE.

FLAMING ARC LAMP.

APPLICATION FILED FEB- 191a.

Patented Oct. 31, 1916.

tJNnn s ra rn rarnnr GEORGE IVL LITTLE, OFPIITSBURGH, PENNSYLVANIA, nssIdNoR r0 WEsr eHo sE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

FLAIVIING-ARC LAMiP;

Specification of Letters Patent.

Patented met. 31, rain.

Appli'c'ation ma February 7, 1913. sat-1am. t46,833.

To all whom it ma concern: 7

Be it known that I, Gnonon M. LITTLE, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Flaming- Arc Lamps, of which the following is a specification. Y

My invention relates to are lamps, and particularly to those commonly known as flaming and luminous arc lamps in which the electrodes, on being consumed at the arc, yield fumes and vapors.

The object of my invention is to provide an arc lamp of the character indicated in which the fumes and vapors given off at the are are prevented from condensing and depositing upon portions of the surface of the inclosing globe immediately adjacent to the arm. This object is attained by furnishing the lamp with a main globe and an outer auxiliary globe surrounding a part of the main globe and providing a dead air space, or an evacuated space, around the portion of the main globe adjacent to the are. This part of the main globe is thereby main tained uniformly hot, and the fumes and vapors will accordingly not condense and deposit thereon.

Figure 1 is a view in elevation and in section, of a portion of a lamp that embodies my invention; Fig. 2 is a view of a modification of the device shown in Fig. 1 and which embodies a form of my invention.

The lamp of the present invention is provided with an inner globe 1 which incloses a space known as an arc chamber 2 and projects through an auxiliary outer globe 3. 1n order to exclude the air from the arc chamber, the upper edge of the inner globe l is accurately ground to make good Contact with the under surface of a globe seat or ring 4 against which the said globe is firmly pressed by means of a spring bail 5. The auxiliary or outer globe 3, being provided with two openings, has, at the periphery of its lower opening, an inwardly projecting flange 6 which assures a substantially airtight fit between the inner globe l and the outer globe 3. The contour of the outer globe should be similar to that of the portion of the inner globe to which it is adjacent. A plurality of holding springs 7 engage the inner and the outer globes and press the outer globe 3 against the under surface of the ring 4. By this arrangement of globes, a dead air space 8 is provided which surrounds the portion of the inner globe 1 that is adjacent to the arc. This dead air space prevents conduction of heat from that part of the globe l which it surrounds, and maintains it uniformly hot. As the fumes or vapors that are emitted from the arc, come into contact with the cooler portionsof the walls of the inner globe 1, condensation of the heavier vapors occurs, and, therefore, deposits are formed on the portions of the inner globe remote from the arc. Because the portion of the inner globe adjacent to the arc is kept hot, no deposits form thereon, and, therefore, no obstruction is offered to the light flux. The lighter vapors yielded at the arc rise and pass from the inner globe 1 through its opening, which registers with an opening in heat-radiating walls 9, into a condensing chamber 10, which is inclosed by the said walls 9. Condensation of the vapors in the condensing chamber occurs when they come in Contact with the cool walls thereof, and deposits are formed similar to those formed on the portions of the inner globe 1 remote from the arc.

In Fig. 2 is shown a view of a modification of the arrangement of the globes shown in Fig. 1. The portion of the globe 11 adjacent to the arc is provided with double walls 12 and 13 spaced apart and integrally formed, which inclose a chamber 14, and the portion of the globe remotely removed from the arc is provided with a single wall. If desired, the chamber 14 may be evacuated, of the gases contained therein which would keep the wall 12 extremely hot and prevent the condensation and the depositing of fumes thereon.

While I have herein described an embodi ment of my invention, it is not intended that my invention, in all its aspects, "shall be limited to this particular embodiment, as it will be apparent to anyone skilled in the art, that changes may be made in the structure without departing from the spirit of the invention.

I claim as my invention:

1. An arc lamp comprising a main globe Closed at its bottom and providing an arc chamber, and an auxiliary globe surrounding the main globe adjacent to the arc and through which the main globe projects.

2. An arc lamp comprising walls providing a condensing chamber, a main globe providing an arc chamber that is closed to the outer air and that communicates With the condensing chamber, and an auxiliary globe that surrounds the main globe adjacent to the arc and through which the main globe projects.

3. An arc lamp comprising heat radiating Walls providing a condensing chamber, a main globe providing an inclosed are chamber that communicates With the condensing chamber, and an auxiliary globe that surrounds the main globe adjacent to the arc 'and through which the main globe projects, the space Within the outer globe having no communication with the arc and condensing chambers.

4. An are lamp comprising an inclosure for an arc chamber closed to the outer air and having a plurality of spaced Walls adjacent to the are and other walls remote from the are.

5. An arc lamp comprising an inclosure for an arc chamber closed to the outer air and having a plurality of spaced Walls oi similar contour adjacent to the are, and other Walls remote from the are.

6. An arc lamp comprising an inclosure for an arc chamber having double Walls spaced apart and inclosing a partial vacuum adjacent to the arc, and single Walls remote from the are.

In testimony whereof, I have hereunto subscribed my name this 4th day of February, 1913.

GEORGE M. LITTLE.

Witnesses:

B. B. HINES, M. C. MERZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. 0.

Corrections in Letters Patent No. 1,202,861.

It is hereby certified that in Letters Patent No. 1,202,861, granted October 31,

1916, upon the application of George M. Little, of Pittsburgh, Pennsylvania, for an improvement in Flaming-Arc Lamps, errors appear in the printed specification requiring correction as follows: Page 1, line 20, for the Word arm read are; page 2,1ine 11, claim 6,f0r the Word single read other; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Olfice.

Signed and sealed this 28th day of November, A. D., 1916.

[SEAL] F. W. H. CLAY,

Acting Commissioner of Patents. Cl. 240 100. 

